Abstract :
[en] We introduce A-ranked preferential structures and combine them with an
accessibility relation. A-ranked preferential structures are intermediate between sim-
ple preferential structures and ranked structures. The additional accessibility relation
allows us to consider only parts of the overall A-ranked structure. This framework
allows us to formalize contrary to duty obligations, and other pictures where we have
a hierarchy of situations, and maybe not all are accessible to all possible worlds.
Representation results are proved.
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